/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.huawei.bigdata.spark.examples.streaming;

import com.huawei.hadoop.security.LoginUtil;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.spark.JavaHBaseContext;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.streaming.Duration;
import org.apache.spark.streaming.api.java.JavaReceiverInputDStream;
import org.apache.spark.streaming.api.java.JavaStreamingContext;

import java.io.IOException;


/**
 * This is a simple example of BulkPut with Spark Streaming
 */

final public class JavaHBaseStreamingBulkPutExample {

  private JavaHBaseStreamingBulkPutExample(){}

  public static void main(String[] args) throws IOException {
    if (args.length < 4) {
      System.out.println("JavaHBaseBulkPutExample  " +
              "{host} {port} {tableName} {columnFamily}");
      return;
    }
    LoginUtil.loginWithUserKeytab();
    String host = args[0];
    String port = args[1];
    String tableName = args[2];
    String columnFamily = args[3];
    SparkConf sparkConf =
            new SparkConf().setAppName("JavaHBaseStreamingBulkPutExample " +
                    tableName + ":" + port + ":" + tableName);

    JavaSparkContext jsc = new JavaSparkContext(sparkConf);

    try {
      JavaStreamingContext jssc =
              new JavaStreamingContext(jsc, new Duration(1000));

      JavaReceiverInputDStream<String> javaDstream =
              jssc.socketTextStream(host, Integer.parseInt(port));

      Configuration conf = HBaseConfiguration.create();

      JavaHBaseContext hbaseContext = new JavaHBaseContext(jsc, conf);

      hbaseContext.streamBulkPut(javaDstream,
              TableName.valueOf(tableName),
              new PutFunction(columnFamily));
      jssc.start();
      jssc.awaitTerminationOrTimeout(60000);
      jssc.stop(false,true);

    }catch(InterruptedException e){
      e.printStackTrace();
    } finally {
      jsc.stop();
    }
  }

  public static class PutFunction implements Function<String, Put> {

    private static final long serialVersionUID = 1L;
    private String columnFamily;

    PutFunction(String cf){
      this.columnFamily = cf;
    }
    public Put call(String v) throws Exception {

      String rowKey = v;
      if (rowKey.length() > 0) {
        System.out.println("rowKey:"+rowKey);
        Put put = new Put(Bytes.toBytes(rowKey));
        put.addColumn(Bytes.toBytes(columnFamily), Bytes.toBytes("foo"), Bytes.toBytes("bar"));
        return put;
      }else{
        return null;
      }
    }

  }
}
